System of elevator control.



J. 0. SMITH. SYSTEM OF ELEVATOR CONTROL. APPLICATION FILED JULY 5,1911.

Patented Sept. 8, 1914.

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INVEN TOR.

A TTORNE 11 JOHN 0. SMITH, OF LOUISVILLE, KENTUCKY.

Specification of Letters Patent.

SYSTEM OF ELEVATOR CONTROL.

Patented Sept. 8, 1914.

Application filed July 5, 1911. Serial No. 636,825.

To all whom it may concern:

Be it known that I, JOHN C. SMITH, a citizen of the United States, residing in Louisville. in the county of Jefferson and State of Kentucky, have invented new and useful Improvements in Systems of Elevator Control, of which the following is a specification.

My invention relates to the apparatus and arrangement of circuits in a system of elevator control," and is of that class known as full magnet control and has for an object the provision of a system of control that shall be safe and efiicient in service.

A further object is the provision of automatic. means for accelerating the speed of the motor so that the elevator can not be started up with a jolt.

Another object is the provision of safety devices whereby precaution is offered against damage due to carelessness and inexperience on the part of the operator.

With the foregoing and other objects in view, my invention consists of the novel construction of apparatus, and arrangement of circuits to bc hcreinatter referred to. and illustrated in the accompanying drawings; which form a part of this specification, in which is set forth an embodiment of my invention, but it is to be understood that changes, variations and modifications may be resorted to that come within the scope of the-claims appended hereunto.

The drawing is a diagrammatic plan of an embodiment of my invention as applied to a motor for operating an elevator, showing the nutor circuits in heavy lines and the controlling circuits in light lines, and the controlling apparatus and safety devices 'as when the motor is at rest. In this position, the shunt fields of the motor are floating on the line 6., receiving chi-rent from the line, the circuit being from the main line switch H, by conductors 2 and 3 to the pivot F on speeding switch through lever F to post F. conductor 4 to po t 1*), on floating field switch E, thr ugh resistance coil E to pivot E". to post id through the magnetcoil of E to ncst E bv conductor 5 to terminal j of shunt ficld o't motor, through shunt field of uiuiol" to terminal f". thence by conductor 6 in )i sl 1 f main line switch ll. it uiil lw \cr-u that the field is constantly exm-IL The w'linn of this circuit is fully dcs vii- 'i and claimed in l'ateld No. lA'Htis it issu d to me D 2 1911 c; gar

Moving the handle of switch K to the left (that is in the up direction) brings elevation 420 into contact with contact finger 426, this gives current to the reversing switch, the circuit being from switch H by conductor 7, through slack cable switch L by conductor 8 to the sector 41.8 in

switch K, through contact finger 416 to wheel $04, out by elevation 420 to contact 4:26 by conductor 9 to and through the up solenoid 301 of the reversing switch, thence by conductor 10 to contact 512 on auto-limit switch J frtm Contact 518 by conductors 11 and 6 to main line switch II. This will set the reversing switch G and the pilot switch lever 332. in the position shown in dotted lines all other parts remaining as shown in full lines. Further movement. of the ear switch i will bring elevation 422 into contact with contact 493, this will give current to the lockingcoil'of the reversing switch, frcm contact 42 by conductor 12 to contact 509 in the limit switch J, from contact 515 therein by conductor 13 to and through upper hatch limit switch, 0 by conductor M to and through locking coil 32?, of the reversing switch, them-t-- by conductor 15 to contact 334, through pilot switch lever 332, thence by conductor it: to and through the coil 101 of the main switch, thence by conductor 17 to contact 23]., through pilot switch lever 229 to post 230, thence by conductor 18 to conductor 23, thence to conductor 2, and switch II, this closes the main switch.

It will be observed that current could not have been given to the main switch A, even by moving car switch so that 423 made contact with 422, until the reversing switch G acted and set the pilot switch lever 332 as the circuit to switch A was open at that point. As the main switch closes, contactor 109 contacts with113111 closing the circuit formed by conductors 19 and 20, that extend from binding posts E and E this short-circuits switch E, lever I) falls away making contact with binding post E, thus cutting the resistance coil E out of the circuit from the line to the shunt fields of the motor, giving the shunt field full line current, thus fully exciting the field magnet before current is given to the armature. Further movement of the car switch K will bring ele ation 421 into contact wiih 425, this will give current to the accelerating switch l as followsz-to the car switch, K as previously described, from contact 425, in car witch, by conductor 32 to contact 517 in limit switch J, from the contact 518 therein by conductor 33 to A and through the solenoid coil 201 of accelerating switch B, thence by conductor 34 to the contact 236, through switch lever 234, thence by conductor 35 to 134 on the main switch A. The acceleratin switch'is now in action, plunger 212 is t e first raised. This as it raise lifts switch lever 229 opening the circuit, previously described, to the main switch A, at 231, this would cause the main switch to drop out but that it had closed a secondary circuit from contact 231 by conductor 36 to and through resistance coil 37, thence b conductor 35 to 134 on the main switch. t will be observed that the coil of the main switch is protected by opening the primary or 0 crating circuit, and closing a secondary or olding circuit, the holding circuit including the resistance 37. The primary circuit being opened by the accelerating switch and secondary closed by the main switch itself. Continued movement of the plunger 212 brings the'switch lever 229 into contact with 232 giving cur rent to switches C and D. The circuit for C being from the main line switch H by conductors 2 and 38 to and through the coil of C, thence by conductors 39 and 41 to contact 232, through lever 229, by conductors 18 and 2 to main line switch H. Energization of C attracts lever C opening a dynamic resistance circuit across the armature terminals of the motor. The dynamic resistance circuit being from armature terminal a by conductor 30 to 317 thence by conductor 42 to and through the lever C thence by conductor 43 to and through resistance 44 thence by conductor 45 to armature terminal a. The circuit for brake switch D is from conductor 38 through coil of D thence by conductors 40 and 41 to contact 232 through lever 229 by conductors 18 and 2- to switch H. This energizes D and attracts the lever 1) cutting the resistance D into the brake magnet circuit. Plunger 212 now comes into contact with "224 cutting the resistance 25 out of the series field and armature circuit, already described; plungers 213 and 214 come into contact with 225 and 226 respectively, cutting resistance coils 25" and 25 successively out of the series field and armature circuit; and speeding up the motor; plunger 215 comes into contact with 227 cutting the series field of the motor out entirely. The motor circuit is .now from 125 on main switch A by conductor 24 to and through the frame of accelerating switch B to contact 227, thence by conductors 48 and 28 to the reversing switch G; from the reversing switch by conductor 29 to motor terminal a through armature of motor to terminal a, thence by conductor 30 to reversing switch G, thence by conductor 31 to 126 on the main switch A. The motor is now running at about half speed. As plunger 215 raised it lifted pilot switch lever 234, breaking contact at 236 and clos ng it at 237. Breaking the contact at 236 cuts resistance 238 into the circuit of solenoid 201 rot-ecting same from overload. Closing t e contact at 237 gives current to one side of speeding-up switch F, that may now be energized by the movement of the car switch K bringing elevation 420 into contact with 427. The circuits is then by conductor 49 to and through the slow down switch N by conductor 50 to and through coil of speeding-up switch, thence by conductor 51 to contact 237, through pilot switch lever 234, thence by conductor 35 to 134 on main switch A, this energizes F attracting the switch lever F and cut ting resistance coil F into the shunt field circuit of motor, and speeding up the same. The shunt field circuit is now from the main switch H by conductors 2 and 3 to and through resistance coil F by conductor 4 to contact B, through switch lever E to binding post E, by conductor 19 to and through contacts 113109114 on main switch "A, by conductor 20 to binding post E by conductor 5 to motor terminal f through shunt field of motor to terminal f thence by conductor 6 to main line switch H. The speeding-up switch F is not under the control of the operator until the accelerating switch B completes its cycle of operations and lifts the pilot switch lever 234 into contact with 237, consequently the car switch lever can be thrown entirely over and the sequence of movements just described will take place without the volition of the operator, and the elevator will start up smoothly and without jar.

To bring the car to a stop the car switch lever is returned to a central position, the various switches acting in sequence and manner reverse to that just described. Should the car lever be moved to the right or down direction, the reversing switch will assume a position the opposite of that shown and the circuit to the armature of the motor will be from 317 to motor terminal A" by con ductor 30 through the armature in thereverse direction to that ust described, and by conductor 29 to 317 on the reversing switch, otherwise the steps will occur as described.

\Vhen the elevator car is going down it may, if heavily loaded, drive the motor as a generator in such case the current generated will pass through the resistance 44 connected across the armature terminals as previously described exerting dynamic braking efl'ect.

With the closing of the main switch A current is given to the series field and armature of the motor as follows :from 125 by ductor 28 to 315 on reversing switch Gr through 317, by conductor 29 to motor terminal a through minal a", thence by through 317-318' switch G, main switch A. motor at slow speed.

armature of motor to terconductor 30 to and This will to 316, of reversing. by conductor 31 to 126'on the start up the- With the closing of the main switch A current is from the main line switch H by conductor 2, to contact 118 and through the lever 123 to points 125 and 133; and

from the switch A,

from points 126 and 134 through the lever 124 to contact 119,,

thence b conductor 2 to the main switch H. I ith this understood the circuits will be traced from and to the main switch points.

Vv'ith the closing of the main switch ,A current is given to the brake magnet M as follows :from post D through lever D to post D by conductor 22 to brake magnet M, from M by conductor 23 to conductor 2-, thence to main line switch H, this releases the brake.

The main potential switch A- may be of any desired type, though preferably of the solenoid type in which av pair of levers are adapted to close the main circuit at two points, and to give current to various of the operating (31113111135, .1 r

The accelerating switch --B-- ispreferably of a construction in which a plurality of members are operated seriatim to cut resistances in and out of circuit, certain of the members being adapted to shift pilot switch levers.

Dynamic resistance switch D, float-in field switch --E, and speeding-up switc i F are of the relay type, preferably that described in Patent ho. 1,048,366, issued to me Dec. 24, 1912.

The reversing switch G is of the type in which a pair of solenoids are adapted to shift, a lever to close appropriate contacts, each of the solenoids lein; provided with a holding coil, the circuit that serves to energiZe the holding coils also energizing the main switch magnet, a moving part of the switch being adapted to shift a pilot switch in the circuit, between the holding coils and the main switch magnet.

The auto-limit switch -J is of the class that located on or in proximity to the motor. is adapted to be driven thereby in such relationship to the travel of the elevator car. that contactors. included in various operating circuits,and bearing on segments carricd by the switch will escape therefrom in predetcrniincd sequence, opening the cirswitch brake- 133 by conductor 21 to circuit,

- H- to the car cuits therethrough andstopping the carat the upptr and lowerwlandings independent of the operator.

A slow-down switch -N- is located in the circuit leading from the car switch to the switch F. COnductOrs 17 and 59 lead from either side of the car. switch-K to contacts N and N. The slow-down switch is carried on the elevator car and the lever N is shifted by stationary guides on the elevator supports, as described in my copending application No. 641,591, filed July 31,1911. It will be observed that the shifting of the arm N wilL 0 en one of the circuits from the car switchmt or N, and that the speeding switch can not again be operated. over that circuit until the lever N is restored, although, it may be operated over the other as'the car travels in the opposite direction. included in the circuit from the wall switch switch K. M indicates the brake magnet. O and I indicate respec tively upper and lower limit switches that are included in the circuits leading from the car switch K through the holdi'ngcoils of the reversing switch. These safety devices being well known in the art need no extended description.

Having described any one skilled in the art pertaining thereto may make and use the same, I claim 1. In a system of motor control, a reversing switch, a main switch, operating circuits for said switches, a manual switch having contacts in said circuits and adapted to close them in the sequence named, an initially open switch interposed in the main switch circuit between said reversing switch and said main switch the contactor of which is connected with a moving part of the reversing switch and adapted to complete the continuity of the main-switch-circuit upon the setting of the reversing switch, said open switch serving to prevent the operation of the main switch until the reversing switch is set.

2. In a system of motor control, a reversing switch, a main switch, and an accelerating switch, operating circuits for said switches, a. manual switch having contacts in said circuits'and adapted to close them in the sequence named, an initially open switch in the main-switch-circuit connected with the reversing switch and adapted to prevent the operation of the main switch until the reversing switch is set, an initially closed switch in the main switch circuit connected with the accelerating switch and adapted to L indicates a slack ,cable switch my invention so that 1 ing switch, switches, a manual switch having contacts in said circuits and operative to close them in the sequence named, holding coils associated with the reversing switch and included in the main switch circuit, an initially open switch in the main-switch circuit the contactor of which is connected with the reversing switch and adapted to be shifted thereby to establish the continuity of the main-switch circuit.

4. In a system of elevator control, a reversing switch, a main switch, and an accelerating switch, operatingcircuits for said switches, holding coils associated with the reversing switch and included in the mainswitch circuit, an initially open switch interposed in the main-switch circuit between the holding coils and the main switch, the contactor of said open switch being connected with a moving part of the reversing switch and adapted to establish the continuity of the main circuit.

5. In a .ystem of elevator control, a shunt wound motor, a reversing switch, a main switch, and an accelerating switch comprising a plurality of members operating acriufz'm, a resistance initially included in the shunt field winding, an electro-magnetic switch controlled by the main switch and adapted to short circuit said resistance. a second resistance, an electromagnetic switch controlled by the last member of the acc'elcrating switch and adapted to insert said second resistance in the shunt field.

6. In a system of motor control, a reversing switch, a main switch, an accelerating switch, operating circuits for said switches, a manual switch having contacts in said circuits and operative to close them in the Sequence named, holding coils associated with the reversing switch and included in the main switch circuit. an initially open switch in the main switch circuit the contactor of which is connected with the reversing switch and adapted to be shifted thereby to establish the continuity of the main switch circuit. an initially closed switch interposed in the main switch circuit and connected with a moving part of the accelerating switch and adapted to be shifted by the closing thereof to break the continuity of the main switch circuit and prevent the operation of the main switch when said accelerat ing switch is closed.

In a system of motor control. a reversing switch. a main switch. an accelerating switcl and a specdingup switch. operating circuits for said switches. a manual switch haying contacts in said circuits and operative to close them in the sctpicncc named. holding coils a ociated with the reversing switch and in lu lcil in the main swit h ciu cuit. an initially open switch in the main switch circuit the contactor of which is ('()lloperating circuits for said nceted with the reversing switch, an initially closed switch in said main switch circuit connected with a moving part of the accelerating switch, an initially open switch in the circuit of said speeding-up switch connected with a moving part of the accelerating switch and adapted to be closed by the closing of said accelerating switch to establis h the continuity of said speeding-up circult.

8. In a systemof motor control, a reversing switch, a main switch, and an accelerating switch, apair of solenoids for operating said reversing switch, a holding-coil for each of said solenoids, an operative circuit for each'of the solenoids and for each of the holding-coils, a circuit for the main switch, a manual switch having contacts in said circuits, an initially open switch connected with a moving part of the reversing switch and adapted to establish the continuity between the holding-coil circuit and the main switch circuit.

9. In a system of motor control,,a reversing switch, a main switch, and an accelerating switch. a pair of solenoids for operating the reversing switch, a holding-coil associated with each solenoid. a circuit for the main switch. a circuit for each of the solenoids and a circuit for each of the holdingcoils, a manual switch having contacts in said circuits and operative to successively close them, an initially open switch the holding-coil circuits terminating on the contacts thereof and the main switch circuit tei'lninat ing on the contactor thereof, the contactor of said open switch being connected to the reversing switch and adapted to establish a continuity between one of the holdingcoil circuits and the main switch circuit.

10. In a system of motor control, a main switch, an accelerating switch comprising a plurality of members operating scm'ati'm, operating circuits for said switches. a manual switch having contacts in said circuits and operative to close them in the sequence named, an initially closed switch in the main switch circuit connected with the first llltllh ber of the accelerating switch and adapted to be opened by the closing of the accelerating switch to break the continuity of the main switch circuit. and a holding circuit for the main switch that terminates on a contact of said main switch and is completed by the closing thereof.

11. In a system of motor control. a rcvers- I ing switch. a main switch and an accelerat- J ing swit h comprising a plurality of H1011) bers operating sari/(Hm. operating circuits 1 for said switches. a manual switch having l contacts in and operative to clc c said circuits in the sequence namcd. an initially l opcn switch and an initially sed witch in thc main switch circuit. *llll op n uil h l adapted to be closed by thc rcv rsing :-witch to complete the continuity of the main switch circuit, said closed switch adapted to be opened by the movement of the accelera ting switch to break the continuity of the main switch circuit, and a holding circuit for the main switch that terminates on a contact of and the continuity of which is completed by the closing of said main switch.

12. In a system of motor control, a revcrsing switch, a main switch and an accelerating switch, operating circuits for said switches, a manual switch having contacts in said circuits and adapted to close them in the sequence named, an initially closed switch in the main switch circuit connected with the accelerating switch and adapted to be opened by the closing thereof to prevent the operation of the main switch by said manual switch when said accelerating switch is closed, a circuit for holding said main switch in a closed position after the operating circuit has been opened by said initially closed switch, said holding circuit terminatin on a contact of and adapted to be completed by the closing of said main switch.

13. In a system of motor control, a reversin switch, a main switch, and an accelerating switch, operating circuits for said switches, a manual switch having contacts in and operative to close said circuits in the sequence named, the circuit for the main switch being normally inoperative, means controlled by the reversing switch for rendering said circuit operative, a holding circuitfor said main switch terminating on a contact of and adapted to be completed by the closing of said main switch.

JOHN 0. SMITH.

Witnesses:

WM. J. SAUER, J 011): G. DAEUBLE. 

